
package com.hulk.ratel.cloud.filter;



import com.hulk.ratel.common.constant.enums.BussErrCode;
import com.hulk.ratel.common.exception.BaseRteException;
import com.hulk.ratel.common.util.JsonMapper;
import com.hulk.ratel.component.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;

/**
 * cloud 过滤器
 *
 * @author hulk
 */
@Slf4j
@Component
@Order(Ordered.LOWEST_PRECEDENCE-1)
@WebFilter(filterName = "cloudFilter", urlPatterns = "/cloud/*")
public class CloudFilter extends OncePerRequestFilter {

    //TODO  feign 拦截器要特殊处理

    private static JsonMapper json = JsonMapper.JSON_NON_DEFAULT_MAPPER;

    @Override
    public void doFilterInternal(HttpServletRequest request, HttpServletResponse resp,
                         FilterChain chain) throws ServletException, IOException {

        try {
            HttpServletRequest req = (HttpServletRequest) request;
            chain.doFilter(new RequestWrapper(req), resp);
        } catch (BaseRteException e) {
            resp.setContentType(MediaType.APPLICATION_JSON_UTF8_VALUE);
            resp.setCharacterEncoding(StandardCharsets.UTF_8.name());
            PrintWriter wr = resp.getWriter();
            wr.write(json.toJson(R.fail(e.getErrorCode(), e.getErrorMessage())));
            wr.flush();
            wr.close();
        } catch (Exception e) {
            resp.setContentType(MediaType.APPLICATION_JSON_UTF8_VALUE);
            resp.setCharacterEncoding(StandardCharsets.UTF_8.name());
            PrintWriter wr = resp.getWriter();
            wr.write(json.toJson(R.fail(BussErrCode.E_999999.getErrCode(), BussErrCode.E_999999.getErrDesc())));
            wr.flush();
            wr.close();
        }
    }


}
